Interaction
May increase the plasma concentrations of oral anticoagulants, digoxin, cilostazol, alprazolam, midazolam (IV), repaglinide, corticosteroids (e.g. budesonide, dexamethasone, fluticasone, methylprednisolone). May increase plasma concentration w/ HIV protease inhibitors (e.g. ritonavir, indinavir, saquinavir), erythromycin, clarithromycin. May reduce plasma concentration w/ isoniazid, carbamazepine, nevirapine, phenytoin, Phenobarbital, rifampicin, rifabutin. May reduce absorption w/ PPIs, antacids, antimuscarinics, histamine H2 receptor antagonists. Concomitant use w/ dihydropyridines may cause oedema. May increase negative inotropic effects of verapamil. May increase risk of potentially fatal resp depression w/ fentanyl. Potentially Fatal: May increase risk of QT prolongation or torsades de pointes w/ astemizole, bepridil, cisapride, dofetilide, levacetylmethadol (levomethadyl), mizolastine, pimozide, quinidine, sertindole, terfenadine, methadone, ranolazine, dronedarone, halofantrine. May increase risk of myopathy including rhabdomyolysis w/ HMG-CoA reductase inhibitors (e.g. atorvastatin, lovastatin, simvastatin). May increase risk of ergotism w/ ergot alkaloids (e.g. ergotamine, dihydroergotamine, ergometrine, methylergometrine). May potentiate hypnotic and sedative effect of triazolam and oral midazolam. May increase plasma concentration of eletriptan, nisoldipine, felodipine, disopyramide, irinotecan, lurasidone; colchicine (patient w/ renal or hepatic failure). May increase risk of hypotension and hyperkalaemia w/ eplerenone.